DSP:ReadPipeIfPossible: Difference between revisions
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|- | |- | ||
| 1 | | 1 | ||
| | | Channel (0 - 7 0:Debug from DSP 1:P-DMA 2:audio 3:binary 4-7: free ?) | ||
|- | |- | ||
| 2 | | 2 | ||
| | | Peer (0 = from DSP, 1 = from ARM) | ||
|- | |- | ||
| 3 | | 3 | ||
| | | u16, Size | ||
|} | |} | ||
| Line 25: | Line 25: | ||
|- | |- | ||
| 0 | | 0 | ||
| ( | | (Size << 14) <nowiki>|</nowiki> 0x2 | ||
|- | |- | ||
| 1 | | 1 | ||
| | | Buffer | ||
|} | |} | ||
| Line 41: | Line 41: | ||
|- | |- | ||
| 1 | | 1 | ||
| | | Result code | ||
|- | |- | ||
| 2 | | 2 | ||
| | | u16, Actual read size | ||
|} | |} | ||
= Channels = | |||
== Channel 2 (Audio) == | |||
Channel 2 returns the DSP DRAM addresses of structures located in the [[DSP Memory Region]]. [[DSP:ConvertProcessAddressFromDspDram]] can be used to convert these addresses into virtual memory addresses. The list of addresses and the length of the list vary depending on DSP firmware version. | |||
== Channel 3 (Binary) == | |||
The purpose of channel 3 is unknown. The behaviour of this pipe varies depending on DSP firmware version. Observed behaviours include: | |||
* doing nothing. | |||
* echoing what is returned to it. | |||
* long strings of zeros. | |||
Latest revision as of 23:39, 7 March 2016
Request
| Index Word | Description |
|---|---|
| 0 | Header code [0x001000c0] |
| 1 | Channel (0 - 7 0:Debug from DSP 1:P-DMA 2:audio 3:binary 4-7: free ?) |
| 2 | Peer (0 = from DSP, 1 = from ARM) |
| 3 | u16, Size |
0x100 byte after the Request header
| Index Word | Description |
|---|---|
| 0 | (Size << 14) | 0x2 |
| 1 | Buffer |
Response
| Index Word | Description |
|---|---|
| 0 | Header code |
| 1 | Result code |
| 2 | u16, Actual read size |
Channels
Channel 2 (Audio)
Channel 2 returns the DSP DRAM addresses of structures located in the DSP Memory Region. DSP:ConvertProcessAddressFromDspDram can be used to convert these addresses into virtual memory addresses. The list of addresses and the length of the list vary depending on DSP firmware version.
Channel 3 (Binary)
The purpose of channel 3 is unknown. The behaviour of this pipe varies depending on DSP firmware version. Observed behaviours include:
- doing nothing.
- echoing what is returned to it.
- long strings of zeros.